399803 has 4 divisors (see below), whose sum is σ = 402288. Its totient is φ = 397320.

The previous prime is 399793. The next prime is 399851. The reversal of 399803 is 308993.

It is a semiprime because it is the product of two primes, and also an emirpimes, since its reverse is a distinct semiprime: 308993 = 193 ⋅1601.

It is a cyclic number.

It is not a de Polignac number, because 399803 - 2⁴ = 399787 is a prime.

It is a Duffinian number.

It is a self number, because there is not a number n which added to its sum of digits gives 399803.

It is not an unprimeable number, because it can be changed into a prime (399853) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (11) of ones.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 983 + ... + 1328.

It is an arithmetic number, because the mean of its divisors is an integer number (100572).

2³⁹⁹⁸⁰³ is an apocalyptic number.

399803 is a deficient number, since it is larger than the sum of its proper divisors (2485).

399803 is a wasteful number, since it uses less digits than its factorization.

399803 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2484.

The product of its (nonzero) digits is 5832, while the sum is 32.

The square root of 399803 is about 632.2997706784. The cubic root of 399803 is about 73.6685320831.

The spelling of 399803 in words is "three hundred ninety-nine thousand, eight hundred three".